Researchers use superionic conductors as electrolytes for solid-state batteries

Solid State Battery

Researchers at the Tokyo Institute of Technology, in collaboration with Toyota and two other research institutions, have designed and tested solid-state batteries using a novel type of solid electrolyte.

In “High-power all-solid-state batteries using sulfide superionic conductors,” published in Nature Energy, Yuki Kato and team members explain the advantages of superionic materials as solid electrolytes.

Previous designs for solid electrolytes have proven expensive, and some have exhibited problems with electrochemical stability. Superionic materials are solid crystal structures through which ions can hop easily, maintaining a flow of ions similar to that which occurs inside a liquid electrolyte.


“Compared with lithium-ion batteries with liquid electrolytes, all-solid-state batteries offer an attractive option owing to their potential in improving the safety and achieving both high power and high energy densities,” write Kato and colleagues. “Despite extensive research efforts, the development of all-solid-state batteries still falls short of expectation largely because of the lack of suitable candidate materials for the electrolyte required for practical applications.”

Two cells based on the superionic materials performed well in trials, remaining stable at a range of temperatures between -30 and 100° C. They achieved high energy and power densities, and small internal resistance levels. The cells also exhibited ultrafast charging, retained their charge for lengthy periods, and appeared to have excellent cycling ability, retaining 75% of their capacity after over 500 cycles.


SEE ALSO: A closer look at electrolytes in advanced batteries


Source: Tokyo Institute of Technology via Green Car Congress

  • Deborah Marie

    Trial and error…It will get better.. 🙂 !!!!!!!!!!!

  • Robert Cattle

    The scale and complexity of chemical ionic solid state electrolytes seems to match the growth in superconductive materials??!! Perhaps the two will meet yielding a superconductive battery structure with zero resistance and very high specific energy density/power density.
    Roll on folks

  • Robert Cattle

    Or should I have suggested that universities investigation super conductivity should liaise with this battery objective??

  • nordlyst

    High density but limited power need not be a big problem. You can always add a high-power low-capacity battery as a buffer, and then you’d only need a few kWh for that.

    I’m in no position to guess what battery breakthroughs are coming or when. But with all that’s going on, I think it’s very likely we’ll see some major advances in addition to the constant evolution that’s already making batteries twice as good every decade…

    Can hardly wait for 2025. I think around then will be the time when incumbent manufacturers begin to put EVs front and center of all their efforts.

    The drawback, as always with fast improving technology, is depreciation. Cars won’t keep their value very well. But this will apply as much or more to ICE as to EVs. Who will want to buy the diesel cars sold today ten years from now? Maybe even five years? If I had to use fossil fuel today, I’d definitely not even consider new or nearly new!